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H323 Interworking Error 2811+MVTS Проблемы в связке 2811+MVTS

Здравствуйте. Прикручивал тут кто-нибудь cisco к mvts?

Есть cisco 2811 (c2800nm-adventerprisek9_ivs-mz.124-24.T5), включена по Е1 в PSTN (также поднят CCM, транскодинг, sip-h323). Есть MVTS 3.1.0. Работать работает, но есть периодически возникающая проблема при звонках MVTS=>2811=>PSTN.

 

%VOICE_IEC-3-GW: H323: Internal Error (H323 Interworking Error): IEC=1.1.127.5.21.0 on callID 74202

 

#sh voice iec description 1.1.127.5.21.0
   IEC Version: 1
   Entity: 1 (Gateway)
   Category: 127 (interworking (127))
   Subsystem: 5 (H323)
   Error: 21 (H323 Interworking Error)
   Diagnostic Code: 0

 

Конфиг 2811:

 

dial-peer voice 95 voip
session target ipv4:10.25.13.200:1720
incoming called-number 9577172......$
dtmf-relay rtp-nte
fax-relay ecm disable
fax rate 9600
fax protocol t38 ls-redundancy 0 hs-redundancy 0 fallback pass-through g711ulaw
ip qos dscp cs7 media
ip qos dscp cs5 signaling
no vad
!
dial-peer voice 9577172 pots
translation-profile outgoing ISDN-NAT
destination-pattern 9577172......$
voice-class aaa 2
direct-inward-dial
port 0/0/1:15

 

Может подскажете, куда курить?

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